12001211028 has 18 divisors (see below), whose sum is σ = 30336394634. Its totient is φ = 4000403664.

The previous prime is 12001211021. The next prime is 12001211059. The reversal of 12001211028 is 82011210021.

It can be written as a sum of positive squares in only one way, i.e., 7591985424 + 4409225604 = 87132^2 + 66402^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×12001211028² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a self number, because there is not a number n which added to its sum of digits gives 12001211028.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001211021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 166683451 + ... + 166683522.

Almost surely, 2^12001211028 is an apocalyptic number.

12001211028 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

12001211028 is an abundant number, since it is smaller than the sum of its proper divisors (18335183606).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12001211028 is a wasteful number, since it uses less digits than its factorization.

12001211028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333366983 (or 333366978 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 12001211028 its reverse (82011210021), we get a palindrome (94012421049).

The spelling of 12001211028 in words is "twelve billion, one million, two hundred eleven thousand, twenty-eight".